Abstract: The present invention is an apparatus and method of encryption. A first table comprising a set of 2.sup.n distinct n-bit input numbers and a first set of 2.sup.n distinct n-bit output numbers is received. A second table comprising of the set of 2.sup.n distinct n-bit input numbers and a second set of 2.sup.n distinct n-bit output numbers is also received. The first and second sets of 2.sup.n n-bit output numbers are each a one-to-one mapping of the set of 2.sup.n n-bit input numbers, and the second mapping of 2.sup.n n-bit output numbers is disjoint from the first mapping of 2.sup.n n-bit output numbers. The first and the second tables are combined and a fourth table of 2.sup.n pairs of (n+1)-bit numbers is generated by converting each of the 2.sup.n pairs of n-bit input numbers and each of the 2.sup.n pairs of n-bit output numbers in the third table, to (n+1)-bit numbers.

Abstract: A combat training system which includes individual processing pods on each aircraft or combat platform. The pods use signals from GPS satellites to determine the position of the respective aircraft, communicate to signal ordnance launch, and determine hits or misses based upon stored missile models. The combat training system further accommodates electronic warfare training. Jamming indicators, including real or simulated jamming signals, are transmitted by a weapons platform or it corresponding pod. The receiving platform adjusts it own real or simulated transmission based upon the received transmission signal. Calculations of hits or misses are determined by the effects of the jamming.

Abstract: A combat training system which includes individual navigation, communications and processing pods on each aircraft or combat platform. The pods use signals from GPS satellites to determine the position of the respective aircraft. Ordnance launch information is transmitted from an attack aircraft or other weapons platform to the target aircraft or other target platform. A target platform uses a trajectory model for the specific type of ordnance for determining the trajectory and the hit or miss of the ordnance. After the mission is completed, the recorded flight data is combined in a ground computer for reconstruction, review and training reinforcement.

Abstract: A frictional damper system particularly suited for use in preventing chatter and flutter in a liquid and two phase flow pressure relief valve. The frictional damper system includes one or more damper bodies each having a vertical through-hole and at least one inclined bore extending from the exterior of the damper body into the vertical through-hole. A friction contact member is positioned within each bore and urged inwardly by a spring device or the like. A portion of the object to be damped, such as the stem of a pressure relief valve, extends through the vertical throughhole. The type of material forming the friction member, the degree of compression by the spring device and the amount of inclination of the bore(s) is such that the vertical compression forces components of the damper spring(s) virtually negate the frictional forces created when the member to be damped moves in a first direction.

Abstract: An X, Y, Z (and .theta.) article positioner and method are disclosed in which two axial elements, one inclined at an angle .alpha. and the other inclined at an angle -.alpha., are utilized in conjunction with each other to accomplish moves in a pure X or pure Z direction or a combination thereof. Each axial element is driven by a lead screw, which in turn is driven by a motor. Pure X movement is achieved by driving the lead screws the same amount, at the same rate, in the same direction. Conversely, to achieve a pure Z movement, the two lead screws are driven the same amount, at the same rate, but in opposite directions. In the preferred embodiment, three superposed and independently driven wedges are used to provide the desired single axis or combinational axis movement to position a workpiece in X, Y and Z with rotational movement of the three wedges providing .theta. axis positioning.

Abstract: A chain conveyor assembly wherein the conveyor chain is constructed to enable the chain to be flexed in two dimensions, e.g., about horizontal and vertical axes, and is designed to convey heavy loads in a stable manner despite the use of a simple and economical conveyor chain. In accordance with a preferred embodiment, the chain conveyor assembly is comprised of a conveyor chain that is formed of a series of wheel units, a guide track arrangement providing surfaces upon which wheels of the wheel units ride, a drive arrangement for driving the conveyor chain, and self-supporting trays for conveying of articles thereon. Each of the trays is coupled to a drive link arrangement that is used to interconnect successive wheel units together and by which the conveyor chain is driven by the drive arrangement.

Abstract: Upper and lower reducing rolls are mounted within a mill housing for rotation about their axes and for parallel movement. Actuating cylinders force the upper reducing roll downward toward the lower reducing roll to effect a separation force on a workpiece that is placed therebetween. Four direct drive motors, one directly coupled to each end of the upper and lower reducing rolls, counter-rotate the reducing rolls to drive the workpiece therebetween. The motors are synchronized within a close tolerance of a set speed to prevent torsion of one end of the reducing rolls relative to the opposite end. Preferably, the rolling mill includes closely enclosed backing rolls engaging the reducing rolls to prevent deflection of the reducing rolls under load. This allows the rolling mill to produce a flat workpiece over a wide range of separation forces by means of cylindrical reducing rolls.

Abstract: A welding head is mounted for movement relative to a fixed base about a plurality of axes. A laser beam, is transmitted from a laser generator to the welding head by an axially flexible but torsionally rigid transmission tube including one or more optically transmitting fibers. The transmission tube is rotatably mounted on the welding head for free rotation about the axis of the emitted laser beam. A lens or other focusing means is provided to focus the laser beam relative to the workpiece, and moving means is provided to move the welding head relative to the laser generating means and the fixed base. A mini-computer or other control means allows control of the moving means to direct the laser beam along the workpiece in a predetermined path. An apertured hood provides protection for the focusing means, and an optional removable probe member provides assistance in programming the apparatus.

Abstract: A metal deposition process and apparatus is used to surface materials and includes a power supply connected to electrode wires and to the workpiece to establish a wire arc between the electrodes and a substrate arc between the positive electrode and the workpiece.

Abstract: A dental articulator of simplified structure, capable of relatively forward and sideward movements to simulate human jaw movements, includes component parts representing lower jaw and maxillary structures held together at simulated condylar joints, wherein spring means press simulated condyles against matching condylar joint walls to hold them in such position when desired and disengaging means are provided which, when actuated, move the spring means away from the associated condyle part, facilitating relative movement of the simulated jaw parts at such joint. When both ends of the spring are moved away from the condyles the jaw portions of the articulator may be separated so that examination of the wear surfaces of dentures held therein may be effected easily.

Abstract: A dental articulator for simulating relative jaw and tooth movements, especially useful for producing centric, lateral and forward relative jaw movements of simulated jaws containing a patient's simulated tooth structure, includes a plurality of selectable, pre-set, positive positions for locating simulated condyles and condylar joints to match those of a patient, shaft means mounted on the condyles, adjustable means for simulating superior, posterior and medial walls of condylar joints and override means to maintain the simulated jaws and teeth in relatively movable centric position when engaging the shaft and allowing accurate simulated forward and sideward relative jaw movements when disengaged therefrom. Also disclosed are preferred means for mounting the condyles and condylar joint wall parts and wall parts of improved structure to promote accurate simulation of actual condylar movements.

Abstract: A length of conduit is coupled at its ends to a heat sink. A pair of thermocouples are joined to the conduit at spaced points intermediate the ends of the conduit. A closed loop of heat conductive material contacts the conduit midway between the thermocouples. The conductive material is heated, and heat is conducted to the conduit. The thermocouples produce outputs representative of the flow of fluid through the conduit.

Abstract: A precision positioning device with a pair of relatively movable plates defining a carriage for four relatively movable guides. A centering port having a rectangular profile is formed by the guides which are constrained for mutually coating movement on the plates. The relative positions of the movable plates define the geometric shape of the centering port and the relative locations of the guides determine the size of the centering port. A pedestal configured to carry the article to be centered is positioned at the center of the centering port. A driver momentarily moves the guides and opens the centering port for reception of the article. Bias elements urge the guides against the item for centering the article on the collet.

Abstract: A length of conduit is coupled at its ends to a heat sink. A pair of thermocouples are joined to the conduit at spaced points intermediate the ends of the conduit. A conductive post is connected at one of its ends to the heat sink and its other end is joined to a location on the conduit, midway between the thermocouples, by conductive material having a higher electrical resistance than both of the joined elements. A coil arrangement is associated with the post and is energized to cause heating current to pass through the post, the high resistance conductive material and the conduit. The heat generated by the flow of heating current is concentrated at the midpoint between the thermocouples. The thermocouples produce outputs representative of the flow of fluid through the conduit.

Abstract: In a system for aligning successive configurations of minute semiconductors during manufacture, any selected configuration is carried on a precision X,Y,.theta. table, which is under the automatic control of (1) a standard television camera that is subject to conventional geometrical and shading distortions, (2) pattern-recognition and motor-control circuitry that corrects these distortions so that precision alignment is possible, and (3) a monitor including a television viewing screen for supervising the system.

Abstract: A method for assembling a large massive steel shell is disclosed for housing a nuclear reactor while having sufficient strength to contain an explosion of such nuclear reactor. The shell is formed of large heavy gauge metal plates which are welded to each other to form a large sphere. Locating and supporting rings are mounted concentrically on a base. The rings increase in height from the center of the sphere to support and locate correspondingly higher annular segments of the sphere. The rings are erected and positioned with precisely adjustable tie rods so that the annular upper edge of the rings have a correspondingly accurately known position with respect to the annular sphere segments to be supported by the rings. The large heavy plate segments are then mounted on the rings and welded together to form a lower spherical portion whose spherical shape closely conforms to that desired for the sphere.

Abstract: There is disclosed an electronic barometric staging unit or aerial cargo delivery actuator for use with cargo carrying or recovery parachutes having an electronic pressure sensing assembly for initiating actuating of a deployment or staging line cutter such that parachute canopy directing and deployment occurs as a programmed function of a barometrically corrected altitude. The invention features a two-part housing assembly carrying the relatively expensive portion of the assembly that is reusable and an expendible or discardable portion of the assembly so that by recovering or retrieving the electronic module, it may be mated up with a new portion so as to substantially reduce the cost of subsequent usages of the apparatus. Since the barometric transducer per se is solid state and of extremely light weight, deceleration moments due to impacting the ground do not in any way impair its operation so that it may be recovered for re-use.

Abstract: A dental flask for use in molding full dentures includes bottom, middle and cover sections capable of being sealed together, either by screws for holding the bottom and cover sections to the middle section by screwing into threaded means in the middle section, or by external compressing means. The flask is of such a structure as to promote even transfer of heat to a synthetic organic polymeric plastic material for gum and palate portions of the denture and to teeth to be held thereby, and internally threaded sealing means are so located at sides of the flask as to apply sealing forces effectively and evenly when cover and bottom screws are tightened and are so located as not to interfere with molding of the denture or heat transfer to the plastic portion thereof during molding.

Abstract: A precision centering device with a pair of relatively movable plates forming a guideway for four relatively movable guides. A tapered centering port having a rectangular profile is formed by the guides which are constrained for mutual coacting movement by the plates. The relative positions of the movable plates define the geometric shape of the centering port and the relative locations of the guides determine the size of the centering port. A reciprocating collet configured to carry a semiconductor chip is received within the centering port at the center thereof. As the collet moves downwardly, the chip is guided through the tapered port and is centered on the collet.

Abstract: A process is provided for cleaning residue fuel varnish and carbon from the fuel nozzles and guide vanes of a jet engine. The process involves dispensing a detergent and water solution under sufficient pressure through the fuel nozzles themselves to scrub residue fuel varnish and carbon from the fuel nozzles and from the guide vanes of a jet engine of an aircraft; without the need for removing the engine from the aircraft, or for removing the nozzles from the engine. The process serves to wet down the surfaces of the fuel nozzles and guide vanes with a detergent solution for a period of time (that is about 20 minutes), and then to scour the surfaces with a pulsating detergent spray, and finally to purge and dry the surfaces with a pressurized air stream.